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SWISS SCIENTISTS FIGURED OUT HOW TO STOP YOUR GLASSES FROM FOGGING UP
ALL IT TAKES IS A LITTLE GOLD
December 12, 2022 - 7:35 pm
STORY BY
TRISTAN GREENE
STORY BY
TRISTAN GREENE
Editor, Neural by TNW
Tristan is a futurist covering human-centric artificial intelligence advances,
quantum computing, STEM, physics, and space stuff. Pronouns: (show all) Tristan
is a futurist covering human-centric artificial intelligence advances, quantum
computing, STEM, physics, and space stuff. Pronouns: He/him
Scientists at ETH Zurich have developed a special coating that prevents the
lenses in glasses from fogging up. Apparently, not all heroes wear capes.
This has been a problem since the advent of optical lenses, but it’s fair to say
it reached a peak during the pandemic when everyone wearing glasses found out
the hard way that most face masks vent your breath up towards your eyes. You’d
think someone would have fixed this by now, but it’s harder than you might
guess.
The difficulty of the problem is evident by the lack of current solutions. You
can wipe your glasses off when they fog up or… well, that’s pretty much it.
There are anti-fog sprays and special lens coatings that help, but those
only minimize the problem.
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You don’t have to be a physicist to understand that the best solution would be
heat. Glasses fog when warm vapor comes into contact with their cooler
lenses. This temperature fluctuation causes the vapor to turn into moisture,
and your glasses turn foggy because they’re wet.
Unfortunately, heating up glasses isn’t a simple task. Using traditional
methods, you’d have to find a transparent material that can be heated
externally, develop a power source for the material, and make sure there’s no
danger of overheating the lenses or heating the frames. That’s a pretty tall
order, especially when you consider that any added bulk or weight will increase
the wearer’s discomfort.
The ETH Zurich team got around these engineering problems by taking a different
approach. They developed a special gold coating that uses solar energy to
produce heat. It doesn’t require a battery or wires or any other components
aside from the coating itself.
The way it works involves placing tiny clusters of gold in between
ultrathin layers of titanium oxide. Gold makes a fantastic heat conductor, and
the titanium oxide layers amplify the metal’s retention just enough to make it
perfectly suited for warming up glass and similar surfaces.
The whole thing is only 10 nanometers thick (the processing size
for some microchips) and can be used with other coatings — so it should work
with transition lenses, and for use in car windshields, for example. In fact,
the scientists are bent on testing the coating on other surfaces such as windows
and mirrors.
It’ll also be interesting to see how this coating could be applied to other
optics such as sensors and lasers. The applications for this coating could
be endless, especially as the scientists insist that it’s not as expensive as
one might think due to the incredibly small amount of gold needed to create the
coating.
It’s unclear exactly how much heat could be generated using this technique, but
the researchers claim it can heat up the surface by as much as 8 degrees
Celsius. That’s certainly enough to keep vapor from fogging up your lenses under
common circumstances. But it’s not quite enough to produce electricity in any
usable amount.
This probably won’t solve the world’s energy crisis, but it certainly has the
potential to make life easier for the billions of us who wear glasses.
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Published December 12, 2022 - 7:35 pm UTC
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